import "./waves.css";

const context = "@@wavesContext";

function handleClick(el, binding) {
  function handle(e) {
    const customOpts = Object.assign({}, binding.value);
    const opts = Object.assign(
      {
        ele: el, // 波纹作用元素
        type: "hit", // hit 点击位置扩散 center中心点扩展
        color: "rgba(0, 0, 0, 0.15)" // 波纹颜色
      },
      customOpts
    );
    const target = opts.ele;
    if (target) {
      target.style.position = "relative";
      target.style.overflow = "hidden";
      const rect = target.getBoundingClientRect();
      let ripple = target.querySelector(".waves-ripple");
      if (!ripple) {
        ripple = document.createElement("span");
        ripple.className = "waves-ripple";
        ripple.style.height = ripple.style.width =
          Math.max(rect.width, rect.height) + "px";
        target.appendChild(ripple);
      } else {
        ripple.className = "waves-ripple";
      }
      switch (opts.type) {
        case "center":
          ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + "px";
          ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + "px";
          break;
        default:
          ripple.style.top =
            (e.pageY -
              rect.top -
              ripple.offsetHeight / 2 -
              document.documentElement.scrollTop || document.body.scrollTop) +
            "px";
          ripple.style.left =
            (e.pageX -
              rect.left -
              ripple.offsetWidth / 2 -
              document.documentElement.scrollLeft || document.body.scrollLeft) +
            "px";
      }
      ripple.style.backgroundColor = opts.color;
      ripple.className = "waves-ripple z-active";
      return false;
    }
  }

  if (!el[context]) {
    el[context] = {
      removeHandle: handle
    };
  } else {
    el[context].removeHandle = handle;
  }

  return handle;
}

export default {
  bind(el, binding) {
    el.addEventListener("click", handleClick(el, binding), false);
  },
  update(el, binding) {
    el.removeEventListener("click", el[context].removeHandle, false);
    el.addEventListener("click", handleClick(el, binding), false);
  },
  unbind(el) {
    el.removeEventListener("click", el[context].removeHandle, false);
    el[context] = null;
    delete el[context];
  }
};
